*Excludes Observations that spanned multiple years

Pre 19702
19701
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19830
19840
19850
19860
19870
198814
19890
19908
199128
19926
199316
199412
199517
199629
19970
19980
19993
20000
20013
20021
20031
20041
20056
200613
20072
20084
20092
2010125
20116
20122
20131
20142
20152
20161
20173
20181
20194
20206
20218
20229
20231
20240
Total341